JP2018179667A - Tensile test fixture unit and tensile test method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a tensile test of a test specimen having a shoulder part that is applied with a tensile force on both ends in a tensile direction, in the high temperature environment.SOLUTION: A tensile test fixture unit installs a shoulder engaging part 15b of an intermediate fixture 15 corresponding to a half-split shape of a shoulder part 33 of a test specimen 3 on a pair of shoulder parts 33, and enables a tapered surface 15c of the shoulder engaging part 15b of each intermediate fixture 15 to be locked on the tapered surface 33a of the shoulders part 33 across its entire circumference. A fitting hole 17a of a parent fixture 17 is fitted to the outside of a pair of intermediate fixtures 15,15 mounted on the shoulder part 33 of the test specimen 3, and an inner circumferential surface of the fitting hole 17a is locked to the fitting tapered surface 15d of each intermediate fixture 15 across its entire circumference. The orientation of parent fixtures 17 fitted to the outside of a pair of intermediate fixtures 15, 15 respectively of each shoulder part 33 of the test specimen 3 is shifted by 45° to a rotation direction R about a central axis C of a fracture part 31 of the test specimen 3, and a four corner of the other parent fixture 17 that projects to the outside of a contour of one parent fixture 17 is applied with a compression load so as to apply a tensile force F to the shoulder part 33 of the test specimen 3.SELECTED DRAWING: Figure 3

Description

  The present invention relates to tensile testing of materials.

  As a method of testing the tensile strength of a material, conventionally, both ends of a test piece in the tensile direction are bonded to a pair of tensile jigs of a tester, and both jigs are separated in the tensile direction to pull It is known how to apply a tensile force in the direction. However, in this method, it is difficult to conduct a test assuming that the material is used in a high temperature environment where the adhesive loses adhesion.

  For this reason, in a tensile test of a general material, both ends of a test piece having a sufficient dimension in the pulling direction are respectively chucked by a pair of jigs of a tester, and both jigs are separated in the pulling direction In many cases, this is performed by a method of applying a tensile force in a tensile direction to a test piece without using an adhesive (for example, Patent Document 1).

Japanese Utility Model Publication No. 64-48656

  However, for example, in the case of a test piece of fiber reinforced composite material such as fiber reinforced plastic (FRP), it is difficult to increase the material size in the direction different from the fiber direction. It is difficult to produce a test piece of a shape in which the portion gripped by the chuck is enlarged.

  Such a problem arises when performing a tensile test in which a tensile force is applied between two members in order to evaluate the adhesive strength of the two members bonded by an adhesive.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a tensile test which can realize a tensile test in a high temperature environment of a test piece having shoulders to which a tensile force is applied at both ends in a tensile direction. It is an object of the present invention to provide a jig unit and a tensile test method capable of suitably performing a tensile test of a test piece using this tensile test jig unit.

In order to achieve the above object, a jig unit for tensile test according to a first aspect of the present invention,
A pair of intermediate jigs which are respectively formed at both ends in the tensile direction of the fractured part broken by application of the tensile force in the tensile direction in the test piece and mounted on the shoulder to which the tensile force is applied;
And a parent jig connected to a tester that holds the pair of intermediate jigs mounted on the shoulders and applies the tensile force to the test piece,
The parent jig for holding the pair of intermediate jigs mounted on one shoulder of the test piece is the other for holding the pair of intermediate jigs mounted on the other shoulder of the test piece. Protruding in the direction intersecting with the central axis from the contour of the other parent jig, with the direction relative to the rotational direction of the central axis extending in the pulling direction relatively offset with respect to the parent jig A plurality of contour portions to which the tensile force is applied are provided at equal intervals in the rotational direction.

  According to the jig unit for tensile test according to the first aspect of the present invention, the direction of the parent jig for holding the pair of intermediate jigs mounted on the one shoulder of the test piece is the same as the other shoulder of the test piece Relative to the direction of the other parent jigs holding the pair of intermediate jigs mounted on the test piece in the rotational direction about the central axis extending in the tensile direction of the test piece, the even intervals in the rotational direction of the parent jigs Each contour protrudes from the contour of the other parent jig in a direction intersecting the central axis.

  For this reason, each contour portion of one parent jig holding a pair of intermediate jigs mounted on one shoulder portion of the test piece holds a pair of intermediate jigs mounted on the other shoulder portion of the test piece A tensile force separating from the other parent jig in the pulling direction can be applied from the front of the other parent jig through the other parent jig.

  Similarly, each contour of the other parent jig holding the pair of intermediate jigs mounted on the other shoulder of the test piece holds the pair of intermediate jigs mounted on one shoulder of the test piece The pulling force separating from the one parent jig in the pulling direction can be applied from the front of the one parent jig through the one parent jig.

  Therefore, in each of the parent jigs holding the pair of intermediate jigs attached to the shoulders of the test piece, each of the parent jigs protrudes from the contour of the other parent jig in the direction crossing the pulling direction By applying a compressive load to the contour portion through each parent jig, a tensile test of the test piece can be performed without using a tensile tester.

  Therefore, it is not necessary to bond the test piece to the tensile jig of the tensile tester or to enlarge the grip portion of the test piece in order to grip the test specimen with the chuck of the tensile tester. Thereby, the tensile test in the high temperature environment of the test piece which has the shoulder part which applies tensile force in the both ends of a tension direction is realizable.

Further, in the tension test jig unit according to the second aspect of the present invention, in the tension test jig unit according to the first aspect of the present invention,
The shoulder portion is formed by a three-dimensional line symmetrical shape having n-fold symmetry (where n is an even number of 4 or more) around the central axis,
Each of the intermediate jigs includes an abutment surface which abuts on each other in a state of being mounted on the shoulder, and a recess formed on the abutment surface and which is mounted on a half of the shoulder. And a half of a three-dimensional line symmetrical shape having m-fold symmetry (where m is an even number of 4 or more) around the central axis in a state in which the other intermediate jig and the abutment surfaces are in contact with each other. And an engaged portion,
Each of the parent jigs has an intermediate jig locking portion which holds the engaged portions of the pair of intermediate jigs attached to the shoulders and in which the contact surfaces are in contact with each other.

  According to the jig unit for tensile test according to the second aspect of the present invention, in the jig unit for tensile test according to the first aspect of the present invention, the shoulders of the test pieces have n-fold symmetry around the central axis ( However, n is an even number greater than or equal to 4 and is formed by a three-dimensional line symmetrical shape, and correspondingly, the shoulder hooking portion of each intermediate jig is constituted by a concave portion of a shoulder portion. .

  Therefore, when the pair of intermediate jigs are attached to the shoulders, the shoulders of the test piece are supported by the shoulder hooks of the pair of intermediate jigs all around the central axis.

  Further, the intermediate jig locking portion of the parent jig is formed by a three-dimensional line symmetrical shape of m-fold symmetry (where m is an even number of 4 or more) around the central axis, corresponding to each intermediate The engaged portion of the jig is formed in a half of the intermediate jig engagement portion of the parent jig.

  Therefore, when the engaged portions of the pair of intermediate jigs in which the contact surfaces are in contact with each other are held by the intermediate jig locking portions of the parent jig, the engaged portions of the pair of intermediate jigs become the parent jig. The intermediate jig locking portion supports the entire circumference around the central axis.

  Therefore, the parent jig and the pair of intermediate jigs are mounted by attaching the pair of intermediate jigs to the shoulder of the test piece and locking the intermediate jig locking portion of the parent jig to the engaged portions of the pair of intermediate jigs. An equal tension can be applied to the shoulder of the test piece all around its circumference.

  In the tensile test jig unit according to the first or second aspect of the present invention, for example, as in the tensile test jig unit according to the third aspect of the present invention, the shoulder portion has the central axis And the intermediate jig locking portion has a circular planar shape having a diameter larger than that of the shoulder portion with the central axis as a center, The shoulder hooking portion of the jig has a semicircular planar shape corresponding to a half of the shoulder portion, and the engaged portion of each of the intermediate jigs is a half of the parent jig. It may have a corresponding semicircular planar shape.

  Moreover, the test piece in the jig unit for tensile test according to the first, second or third aspect of the present invention is formed of, for example, a fiber-reinforced composite material having a fiber as a base material, and the tensile direction is The fibers of the fiber-reinforced composite material may not extend.

Furthermore, a jig unit for tensile test according to a fourth aspect of the present invention is the jig unit for tensile test according to the first, second or third aspect of the present invention,
Attached to the other shoulder of the test piece through the outside in the direction intersecting the central axis of one of the parent jigs holding the pair of intermediate jigs attached to one of the shoulders of the test piece Is brought into contact with the contour portions of the other parent jig holding the pair of intermediate jigs, and the force in the opposite direction to the pulling direction applied from the front of the one parent jig is the one parent jig One of the load transmission jigs that transmits to each of the contour portions of the other parent jig over the other;
Through the outside in the direction intersecting with the central axis of the other parent jig, it abuts on each of the contour portions of the one parent jig, and the reverse direction to the pulling direction applied from the front of the other parent jig The other load transmission jig for transmitting the force of the second parent jig to the respective contour portions of the one parent jig through the other parent jig;
Further comprising

  According to the jig unit for tensile test according to the fourth aspect of the present invention, in the jig unit for tensile test according to the first, second or third aspect of the present invention, one of the load transfer jigs is a proclivity of one The force in the opposite direction to the pulling direction transmitted to the other parent jig from the front of the tool to the other parent jig, and the other load transfer jig from the front of the other parent jig to the other parent jig The pulling direction and the force in the opposite direction to be transmitted to each other are a compressive load that causes both load transmission jigs to approach in the direction opposite to the pulling direction.

  For this reason, by applying a compressive load to both load transmission jigs, a tensile force in the pulling direction is easily applied to each shoulder of the test piece via each parent jig which each load transmission jig abuts. be able to.

Further, a jig unit for tensile test according to a fifth aspect of the present invention is
A pair of intermediate jigs mounted respectively on a pair of shoulders to which a tensile force in a tensile direction in the test piece is applied;
A first parent jig holding one of the intermediate jigs and having a contour portion;
A second parent member having a contour portion and being disposed with a direction in a rotational direction around a central axis extending in the pulling direction shifted relative to the first parent jig and holding the other intermediate jig Tools,
And a load transmission jig for transmitting a force by contacting each of the contours of the first parent jig and the second parent jig,
The contour portions of the first parent jig and the second parent jig protrude from the other parent jig in a direction intersecting the central axis, and a plurality of contour portions exist at equal intervals in the rotation direction,
The load transfer jig transmits a force opposite to the tensile force of the test piece to the contours of the first parent jig and the second parent jig.

  According to the jig unit for tensile test according to the fifth aspect of the present invention, the direction of the first parent jig for holding the intermediate jig mounted on one of the shoulders of the test piece is the same as that of the other shoulder of the test piece Relative to the direction of the second parent jig that holds the intermediate jig mounted on the part, the rotational direction of each parent jig etc. Contours at intervals protrude from the contour of the other parent jig in the direction intersecting the central axis.

  Therefore, each contour of the first parent jig holding the intermediate jig mounted on one shoulder of the test piece and the second jig holding the intermediate jig mounted on the other shoulder of the test piece The tensile force of the test piece and the force opposite to that of the test piece can be transmitted to the respective contour portions of the parent jig by the load transmission jig through the other parent jig.

  Therefore, in each of the parent jigs holding the pair of intermediate jigs attached to the shoulders of the test piece, each of the parent jigs protrudes from the contour of the other parent jig in the direction crossing the pulling direction By applying a compressive load to the contour portion through each parent jig, a tensile test of the test piece can be performed without using a tensile tester.

  Therefore, it is not necessary to bond the test piece to the tensile jig of the tensile tester or to enlarge the grip portion of the test piece in order to grip the test specimen with the chuck of the tensile tester. Thereby, the tensile test in the high temperature environment of the test piece which has the shoulder part which applies tensile force in the both ends of a tension direction is realizable.

  The operation and effects of the jig unit for tensile test according to the first, second, third, fourth or fifth aspect of the present invention described above are the same as those of the tensile test method according to the sixth aspect of the present invention As described above, jigs are mounted on the shoulders respectively formed at both ends in the tensile direction of the fractured part broken by application of tensile force in the tensile direction in the test piece, and the jig is used to carry out the above A tensile test jig according to the first, second, third, fourth or fifth aspect of the present invention as the jig when applying a tensile force in the tensile direction to a fractured part to conduct a tensile test By applying a tensile force in the pulling direction to each contour portion of the parent jig of the jig unit for tensile test attached to the shoulder using a unit, it is possible to obtain more prominently.

  According to the present invention, a tensile test jig unit capable of realizing a tensile test in a high temperature environment of a test piece having shoulders applied with tensile force at both ends in the tensile direction, and the tensile test jig unit The tensile test of the test piece can be suitably performed using

It is a perspective view showing a jig unit for tension tests concerning one embodiment of the present invention, and a ram used by a tension test using the same. (A) is a perspective view of the test piece of FIG. 1, (b) is the front view. (A) is a top view of the jig unit for tensile tests of FIG. 1, (b) is a longitudinal cross-sectional view. It is a perspective view which shows the procedure of latching the jig unit for tension tests of FIG. 3 to the test piece of FIG. (A) is a top view of the lower ram of the tensile tester of FIG. 1, (b) is the same longitudinal cross-sectional view, (c) is a bottom view of the upper ram.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the test piece on the drawing referred in the following embodiment only shows a conceptual structure to the last, and a dimensional ratio, an angle, etc. of each part do not necessarily correspond with an actual dimensional ratio. It should be noted that.

  FIG. 1 is a perspective view showing a tensile test jig unit according to an embodiment of the present invention and a ram used in a tensile test using the same. As shown in FIG. 1, when performing a tensile test of a test piece 3, a tensile test jig unit (hereinafter abbreviated as “jig unit”) 1 of the present embodiment, the tensile force of the test piece 3. F (see FIG. 2 (a)) is used to hold a point to be applied and connect it to a tensile tester (not shown).

  Here, the structure of the test piece 3 will be described with reference to FIG. 2 (a) is a perspective view of the test piece 3, and FIG. 2 (b) is a front view of the test piece 3 as well.

  And as shown to Fig.2 (a), the test piece 3 is the truncated cone shape respectively formed in the extending direction of the fracture | rupture part 31 formed in the column shape, and the central axis C of this fracture | rupture part 31 in the extension direction And a pair of shoulders 33,33. That is, each shoulder 33 is formed by an infinite number of times of round three-dimensional line symmetry of a plane view circle symmetrical around the central axis C.

  The circumferential surface of each shoulder 33 is, as shown in FIG. 2B, formed of a tapered surface 33a whose diameter is larger than that of the fracture portion 31 as it goes to the both ends of the test piece 3. The tapered surface 33 a is inclined 45 ° with respect to the end surface 33 b of the shoulder portion 33 in the present embodiment. A tensile force F is applied to each shoulder 33 in such a direction as to be separated from the other shoulder 33 along the central axis C of the fracture portion 31.

  In this embodiment, the test piece 3 is formed of, for example, a fiber-reinforced composite material having a fiber as a base material, such as a carbon fiber-reinforced composite material, and the direction in which the fibers of the base material are not extended It is in the direction of axis C. Then, by breaking the fracture portion 31 by the tensile force F applied to each shoulder 33 along the central axis C, the test strip 3 in the direction of the central axis C in which the fibers of the base material are not extended Tensile strength can be tested.

  The jig unit 1 of FIG. 1 used for the tensile test of the test piece 3 is used in pair to hold the shoulders 33 of the test piece 3. 3 (a) is a plan view of the jig unit 1, and FIG. 3 (b) is a longitudinal sectional view of the jig unit 1. FIG.

  As shown in FIG. 3 (b), each jig unit 1 of the present embodiment includes a pair of intermediate jigs 15 and 15 mounted on each shoulder 33 of the test piece 3 and a pair of intermediate jigs 15. , 15 are provided with a parent jig 17.

  Each intermediate jig 15 is attached to each shoulder 33 of the test piece 3 and is formed in an arc shape having a semicircular planar shape. Then, each intermediate jig 15 is formed into an abutment surface 15 a that abuts on each other in a state of being attached to the shoulder 33 and a shoulder pull formed on the abutment surface 15 a and locked to the shoulder 33 of the test piece 3 And a hanging portion 15b.

  Therefore, as shown in FIG. 3A, the pair of intermediate jigs 15 and 15 have an annular shape in a plan view when the contact surfaces 15a are in contact with each other. Each intermediate jig 15 is formed in a plate shape having the same thickness as the dimension of the shoulder portion 33 in the direction of the central axis C of the fracture portion 31 of the test piece 3, as shown in FIG. 3 (b).

  The shoulder hooking portion 15b of each intermediate jig 15 corresponds to the shoulder portion 33 of the test piece 3 across the abutting surface 15a in a state where the abutting surfaces 15a of the pair of intermediate jigs 15 are in contact with each other. It is formed in the shape of a truncated cone. That is, the shoulder hooking portion 15b of each of the intermediate jigs 15 is configured by a concave portion obtained by dividing the truncated cone shape into halves in the circumferential direction.

  As shown in FIG. 3B, the inner peripheral surface of the shoulder hooking portion 15b has a tapered surface 15c with an inclination of 45 ° corresponding to the tapered surface 33a of the shoulder portion 33. Since each intermediate jig 15 is attached to the shoulder portion 33 by bringing the tapered surface 15c into contact with the tapered surface 33a of the shoulder portion 33, each intermediate jig 15 is not in the direction of the central axis C, As shown in the perspective view of 4, the shoulder 33 of the test piece 3 is mounted from the radial direction X of the central axis C (corresponding to the direction intersecting the pulling direction in the claims). When each intermediate jig 15 is attached to the shoulder 33 of the test piece 3, as shown in FIG. 3B, the end face 33b of the shoulder 33 is at the opening of the shoulder hook 15b of the intermediate jig 15. Exposed.

  Each intermediate jig 15 is brought into contact with the shoulder portion 33 by bringing the tapered surface 15 c of the shoulder hooking portion 15 b of the pair of intermediate jigs 15 and 15 into contact with the half circumferential portion of the tapered surface 33 a of the shoulder portion 33 of the test piece 3. When mounted, the contact surfaces 15a of the intermediate jigs 15 contact each other. Then, since the diameter of the shoulder 33 is larger on the end face 33b side than on the broken part 31 side, the movement of the shoulder 33 to the broken part 31 side along the central axis C with respect to the intermediate jig 15 is restricted. . As a result, the shoulder hooking portion 15 b of each intermediate jig 15 is locked to a half portion of the shoulder portion 33 of the test piece 3.

  Incidentally, on the surface of each intermediate jig 15 opposite to the contact surface 15a, a fitting taper surface 15d (corresponding to a locked portion in the claims) is formed. The fitting taper surface 15d is formed in a frusto-conical shape concentric with the taper surface 15c of the shoulder hook 15b, and has the same 45 ° inclination as the taper surface 15c.

  The parent jig 17 has a square shape in plan view, and is formed in a plate shape having the same thickness as the intermediate jig 15. The parent jig 17 has a fitting hole 17a (corresponding to an intermediate jig locking portion in the claims) in which the pair of intermediate jigs 15 mounted on the shoulder portion 33 of the test piece 3 is fitted. It has an end face 17b to which a tensile force F is applied by pressing of a later-described ram of the testing machine shown.

  The fitting hole 17a penetrates between the end surface 17b of the parent jig 17 and the end surface 17c on the opposite side. The inner peripheral surface of the fitting hole 17a is formed in a truncated cone shape corresponding to the fitting taper surfaces 15d of the pair of intermediate jigs 15 in a state where the contact surfaces 15a are in contact with each other. . Therefore, the inclination of the inner peripheral surface of the fitting hole 17a with respect to the end faces 17b and 17c of the parent jig 17 is 45 °. Thus, the opening of the fitting hole 17a has a larger diameter at the end surface 17c opposite to the end surface 17b to which the tensile force F is applied.

  In FIG. 3B, the dimension in the radial direction X is different between the upper parent jig 17 corresponding to one shoulder 33 of the test piece 3 and the lower parent jig 17 corresponding to the other shoulder 33. ing. However, as shown in FIG. 3A, this is a half of the angle (90 °) of the four corners of the parent jig 17 in the rotation direction R around the central axis C, as shown in FIG. The upper and lower parent jigs 17 are formed in the same shape (square shape in plan view).

  The jig unit 1 of this embodiment matches the direction of inclination of the tapered surface 33 a of the shoulder 33 and the tapered surface 15 c of the shoulder hook 15 b with each shoulder 33 of the test piece 3 to form an intermediate jig 15. Wear one pair each. As a result, the tapered surface 33a of the shoulder 33 of the test piece 3 abuts on the tapered surfaces 15c of the pair of intermediate jigs 15, 15, and the fractured portion 31 along the central axis C with respect to the intermediate jig 15 of the shoulder 33 The movement to the side is restricted, and the tapered surface 15 c of the intermediate jig 15 is engaged with the tapered surface 33 a of the shoulder 33.

  At this time, when the pair of intermediate jigs 15 and 15 are attached to one of the shoulders 33, next, the fitting tapered surface 15 d of each intermediate jig 15 and the taper surface of the fitting hole 17 a of the parent jig 17 are The fitting holes 17a of the parent jig 17 are fitted to the outside of the pair of intermediate jigs 15 in accordance with the direction of the inclination. As a result of this fitting, the fitting taper surface 15d of each intermediate jig 15 abuts on the taper surface of the fitting hole 17a of the parent jig 17, and the broken portion along the central axis C of the middle jig 15 with respect to the parent jig 17 The movement to the 31 side is restricted, and the tapered surface 15c of the intermediate jig 15 is engaged with the tapered surface of the fitting hole 17a.

  Then, reaction forces in the radial direction X act on the fitting tapered surfaces 15 d of the respective intermediate jigs 15 from the tapered surfaces of the fitting holes 17 a. Due to this reaction force, the contact force between the contact surfaces 15a of the pair of intermediate jigs 15, 15 is strengthened, and the taper surface 15c of the shoulder hook 15b of each intermediate jig 15 and the taper of the shoulder 33 of the test piece 3 The contact force with the surface 33a is intensified. Thereby, the locking of the shoulder hook 15b with respect to the shoulder 33 is strengthened.

  In this state, the end surface 17 b (the surface to which the tensile force F is applied) of the parent jig 17 is located on the side of the broken portion 31 of the test piece 3. Further, the end face 33 b of the shoulder 33 of the test piece 3 is exposed at the opening of the fitting hole 17 a having a diameter larger than the end face 17 b of the end face 17 c of the parent jig 17.

  Subsequently, the shoulder 33 of one of the test pieces 3 on which the intermediate jig 15 is not attached is fitted to the pair of intermediate jigs 15 and 15 in the fitting hole 17a of another parent jig 17. The tool 17 is inserted with the end faces 17b and 17c opposite in direction.

  Then, on the end face 17c side of the parent jig 17 from which the shoulder 33 passing through the fitting hole 17a protrudes, the direction of inclination of the taper surface 33a of the shoulder 33 and the taper surface 15c of the shoulder hook 15b is matched. The pair of intermediate jigs 15 is mounted on the shoulder portion 33. Then, the direction of inclination of the taper surface of the fitting hole 17a of the parent jig 17 into which the shoulder 33 has been inserted first and the taper surface 15d of fitting of the pair of intermediate jigs 15 coincide with each other.

  Therefore, the fitting holes 17a of the parent jig 17 inserted previously are fitted to the outside of the pair of intermediate jigs 15, 15. By this fitting, the tapered surface of the fitting hole 17a of the other parent jig 17 also abuts on the fitting tapered surface 15d of each intermediate jig 15, and along the central axis C with respect to the parent jig 17 of the intermediate jig 15. The movement to the broken part 31 side is restricted, and the tapered surface 15c of the intermediate jig 15 is engaged with the tapered surface of the fitting hole 17a.

  Due to this locking, a reaction force in the radial direction X acts on the fitting taper surface 15d of each intermediate jig 15 from the taper surface of the fitting hole 17a, and this reaction force also causes the other parent jig 17 side. The locking of the shoulder hook 15b of each intermediate jig 15 fitted in the fitting hole 17a of the parent jig 17 with the shoulder 33 is strengthened.

  In this state, an end face 17 b (a surface to which a tensile force F is applied) of another parent jig 17 which is fitted to the outside of the pair of intermediate jigs 15, 15 later is also the fracture portion 31 of the test piece 3. Located on the side. Further, the end face 33 b of the shoulder 33 of the test piece 3 is exposed at the opening of the fitting hole 17 a having a diameter larger than the end face 17 b of the end face 17 c of another parent jig 17.

  Here, when the respective parent jigs 17 are respectively fitted to the pair of intermediate jigs 15 and 15 attached to the respective shoulders 33, the positions of the respective parent jigs 17 are as shown in FIG. 3A. , 45 degrees in the direction of rotation. Thereby, the four corners of the end face 17b to which the tensile force F of the parent jig 17 is applied overlap the direction of the central axis C, and the side of the other parent jig 17 (outside of the parent jig 17 in the radial direction X) Exposed to

  When a tensile force F is applied to each shoulder 33 of the test piece 3 by a testing machine (not shown) using the jig unit 1 of the present embodiment configured as described above, The upper ram 21 and the lower part of the test piece 3 and the jig unit 1 in the state shown in FIGS. 3 (a) and 3 (b) to which the jigs 15 and 15 and the parent jig 17 are respectively attached are shown. Install between the side rams 23.

  5 (a) is a plan view of the lower ram 23 of the rams of FIG. 1, (b) is a longitudinal sectional view of the lower ram 23 in the same manner, and (c) is a bottom view of the upper ram 21 of the rams of FIG. It is.

  The lower rams 23 (corresponding to the other load transmission jig in the claims) shown in FIGS. 5A and 5B are shifted by 90 ° in the circumferential direction from the peripheral portion of the disk-shaped base plate 23a. The four support legs 23b are erected. The support legs 23b have four corners of one parent jig 17 out of two parent jigs 17 whose positions are shifted by 45.degree. In the rotational direction as shown by an imaginary line in FIG. 5A. (Corresponding to the contour portion of the parent jig) and not to interfere with the other parent jig 17.

  Among the four support legs 23b, guide holes 23c are formed in two support legs 23b shifted by 180 °. The guide hole 23c is for guiding the vertical movement of the lower ram 23 of the upper ram 21 shown in FIG.

  Similarly to the lower ram 23, the upper ram 21 (corresponding to one load transmission jig in the claims) shown in FIG. 5 (c) is circumferentially 90 ° from the peripheral edge of the disk-shaped base plate 21a. The four support legs 21b are erected at different positions. The erected positions of the four support legs 21b with respect to the base plate 21a are the erected positions of the four support legs 23b with respect to the base plate 23a of the lower ram 23 and the rotational direction, as understood from comparison with FIG. 5A. Shifted 45 degrees to

  Therefore, each of the support legs 21b of the upper ram 21 is not interfered with each support leg 23b of the lower ram 23 among the two parent jigs 17 whose positions are shifted by 45.degree. In the rotational direction as indicated by imaginary lines. It is formed so as not to interfere with the four corners of the parent jig 17 (corresponding to the contour portion of the parent jig in the claims) and one parent jig 17 where the support legs 23b of the lower ram 23 interfere with the four corners. ing.

  Note that two guide shafts 25 and 25 are disposed at positions shifted in the rotational direction by 45 ° from the two adjacent support legs 21b of the base plate 21a by shifting the positions by 180 ° in the rotational direction. It is set up. Each guide shaft 25 is axially movably inserted into the corresponding guide hole 23 c of the lower ram 23.

  Then, when applying the tensile force F to each shoulder 33 of the test piece 3 to which the jig unit 1 is attached, first, each support of the upper ram 21 than the tip of each support leg 23 b of the lower ram 23 The upper ram 21 is moved upward relative to the lower ram 23 so that the tip of the leg 21b is positioned upward.

  In this state, among the test pieces 3 and the jig unit 1 shown in FIGS. 3A and 3B, the four corners of the parent jig 17 of the lower jig unit 1 are supported by the lower ram 23 It inserts in the space between each support leg 23b in the rotation position which does not interfere with the leg 23b, and places the four corners of the parent jig 17 of the upper jig unit 1 on each support leg 23b of the lower ram 23.

  Then, the upper ram 21 is moved relative to the lower ram 23 downward, and passes by the four sides of the parent jig 17 of the upper jig unit 1 with the four corners placed on the support legs 23 b of the lower ram 23. The tips of the support legs 21b are brought into contact with the four corners of the parent jig 17 of the lower jig unit 1 inserted between the support legs 23b of the lower ram 23. Thus, the upper ram 21 and the lower ram 23 have the positional relationship shown in FIG. 1 with respect to the parent jigs 17 of the upper and lower jig units 1.

  In this state, a compressive load Fc for moving the upper ram 21 downward relative to the lower ram 23 is applied between the upper ram 21 and the lower ram 23 by a testing machine (not shown). Then, with respect to the parent jig 17 of the upper jig unit 1 in which each support leg 21 b of the upper ram 21 places the parent jig 17 of the lower jig unit 1 on each support leg 23 b of the lower ram 23. Move relative to the bottom.

  Therefore, both jigs are applied by applying a compressive load Fc that brings the upper ram 21 closer to the lower ram 23 with a testing machine (not shown) between the parent jigs 17 of the upper and lower jig units 1, 1 A tensile force F is applied to both shoulders 33 of the test piece 3 through the parent jig 17 of the unit 1 and the pair of intermediate jigs 15. Then, the tensile force F at the time of the fracture | rupture part 31 of the test piece 3 fractures is measured.

  As described above, according to the jig unit 1 of the present embodiment, the shoulder hooking portions 15b of the intermediate jig 15 corresponding to the half shape of the shoulder portion 33 of the test piece 3 are mounted on the shoulder portion 33 as a pair The tapered surface 15c of the shoulder hook 15b of the intermediate jig 15 is engaged with the tapered surface 33a of the shoulder 33 over the entire circumference thereof.

  Then, a pair of intermediate jigs 15 and 15 attached to the shoulders 33 of the test piece 3 are fitted in the fitting holes 17 a of the parent jig 17 to make each tapered surface of the fitting holes 17 a and each intermediate jig 15 The fitting taper surface 15 d is fitted, and a tensile force F is applied to the shoulder portion 33 of the test piece 3 from the parent jig 17 through the intermediate jig 15.

  For this reason, even if each shoulder 33 of the test piece 3 can not be directly supported over the entire circumference by each parent jig 17 to which the compressive load Fc from the testing machine is relatively applied, The shoulder 33 of the test piece 3 can be supported over the entire circumference by the shoulder hooking portions 15b of the pair of intermediate jigs 15, 15 fitted in the fitting holes 17a.

  Therefore, the tensile force F is concentrated on a part of the shoulder portion 33 in the circumferential direction to prevent the shoulder portion 33 from breaking earlier than the breakage portion 31, and the entire circumference of the shoulder portion 33 of the test piece 3 is As the tensile force F is uniformly applied over the entire surface, the breaking portion 31 can be reliably broken by the tensile force F.

  Further, in a state where the end surface 33b of the shoulder portion 33 of the test piece 3 to which the pair of intermediate jigs 15 and 15 are attached is fitted in the fitting hole 17a of the parent jig 17, the parent It was made to expose to opening of fitting hole 17a in end face 17c of tool 17.

  Therefore, for example, when it is necessary to evaluate the tensile strength of the test piece 3 in relation to the temperature of the test piece 3, the support legs 21 b and 23 b of the upper ram 21 and the lower ram 23 and the guide shaft 25 If interference is avoided, the wiring of a temperature measuring element such as a thermocouple for measuring the temperature of the test piece 3 can be easily connected to the shoulder 33 of the test piece 3.

  In the present embodiment, although the shoulder 33 of the test piece 3 is circular in plan view, the plan view shape of the shoulder of the test piece is not limited to circular, for example, square, regular hexagon, regular octagon or regular decagon Etc. may be a regular n-gon (where n is an even number of 4 or more). In that case, a tapered surface is formed on the circumferential surface of the shoulder corresponding to each side of the shoulder in plan view, and the shoulder is n-fold symmetric (but n Is an even number of 4 or more).

  Therefore, the shoulder hooking portion of the intermediate jig attached to the shoulder portion of the test piece is also n-fold symmetric around the central axis extending in the pulling direction corresponding to the shape of the shoulder portion (where n is 4 or more) The even number of three-dimensional line symmetrical shape of the concave portion.

  Similarly, in the present embodiment, the fitting tapered surfaces 15d of the intermediate jigs 15 and 15 are circular in plan view, but the plan view shape of the engaged portion of the intermediate jig is not limited to a circle, for example, a square And may be a regular m-gon (where m is an even number of 4 or more), such as a regular hexagon, a regular octagon, a regular decagon or the like. In that case, a tapered surface is formed on the peripheral surface of the locked portion corresponding to each side of the locked portion in plan view, and the locked portion is m around the central axis extending in the pulling direction. It becomes a three-dimensional line symmetrical shape of circular symmetry (however, m is an even number of 4 or more).

  Therefore, the intermediate jig locking portion of the parent jig that holds the locked portion of the intermediate jig is also m-fold symmetric around the central axis extending in the pulling direction corresponding to the shape of the locked portion (however, , M is an even number of four or more even three-dimensional line symmetrical shapes.

  In the present embodiment, the fitting tapered surfaces 15d of the pair of intermediate jigs 15 and 15 and the fitting holes 17a of the parent jig 17 with the abutting surfaces 15a in contact with each other are infinitely large around the central axis C. The three-dimensional line-symmetrical shape has a circular shape in plan view and is symmetrical in terms of the number of times. Therefore, the tensile force F is not concentrated and applied to a part of the fitting tapered surfaces 15d of the pair of intermediate jigs 15 and 15 in the circumferential direction, and the tensile force F is uniformly applied to the front end in the circumferential direction.

  Therefore, only a part of the fitting taper surface 15 d of each intermediate jig 15 is not pulled up in the direction of the tensile force F by the force applied from the inner peripheral surface of the fitting hole 17 a of the parent jig 17. Therefore, it is suppressed that the intermediate jig 15 is detached from the fitting hole 17a of the parent jig 17 so that the pair of intermediate jigs 15 and 15 are folded at the boundary between the abutting surfaces 15a. Can.

  Further, in the present embodiment, the plan view shape of the parent jig 17 is a square, but it may be a regular p-gon (p is an even number of 4 or more), such as a regular hexagon, a regular octagon, a regular decagon or the like. In that case, when the pair of intermediate jigs 15 and 15 respectively attached to the shoulders 33 of the test piece 3 are respectively fitted into the fitting holes 17a of the parent jig 17, both parent jigs 17 are attached to each corner (Θ = 360 ° / p) half of the angle θ (θ = 360 ° / p). Then, supporting legs respectively contacting the corners of the parent jigs 17 corresponding to the contours in the claims may be erected on the base plates 21 a and 23 a of the upper ram 21 and the lower ram 23.

  Furthermore, the present invention is applicable not only to fiber reinforced composite materials, but also to a jig unit for holding a test piece when testing the tensile strength of other materials. The present invention is also applicable to a jig unit for holding a test piece when testing adhesive strength.

  Further, it is needless to say that the jig unit for tensile test and the tensile test method of the present invention can be widely implemented with a tester other than the tester shown in the above-described embodiment.

1 Jig unit 3 Test piece 15 Intermediate jig 15a Contact surface 15b Shoulder hook 15c Tapered surface (intermediate jig tapered surface)
15d Tapered surface for fitting (locked part)
17 parent jig 17a fitting hole (intermediate jig locking portion)
17b, 17c Parent jig end face 21 Upper ram (one load transmission jig)
21a, 23a Base plate 21b, 23b Support leg 23 Lower ram (other load transfer jig)
23c guide hole 25 guide shaft 31 fracture part 33 shoulder part 33a shoulder taper surface 33b shoulder end face C central axis of fracture part F tensile force Fc compressive load R rotational direction X radial direction (direction intersecting central axis)

Claims (6)

A pair of intermediate jigs which are respectively formed at both ends in the tensile direction of the fractured part broken by application of the tensile force in the tensile direction in the test piece and mounted on the shoulder to which the tensile force is applied;
And a parent jig connected to a tester that holds the pair of intermediate jigs mounted on the shoulders and applies the tensile force to the test piece,
The parent jig for holding the pair of intermediate jigs mounted on one shoulder of the test piece is the other for holding the pair of intermediate jigs mounted on the other shoulder of the test piece. Protruding in the direction intersecting with the central axis from the contour of the other parent jig, with the direction relative to the rotational direction of the central axis extending in the pulling direction relatively offset with respect to the parent jig A plurality of contour portions to which the tensile force is applied at equal intervals in the rotational direction,
Jig unit for tensile test. The shoulder portion is formed by a three-dimensional line symmetrical shape having n-fold symmetry (where n is an even number of 4 or more) around the central axis,
Each of the intermediate jigs includes an abutment surface which abuts on each other in a state of being mounted on the shoulder, and a recess formed on the abutment surface and which is mounted on a half of the shoulder. And a half of a three-dimensional line symmetrical shape having m-fold symmetry (where m is an even number of 4 or more) around the central axis in a state in which the other intermediate jig and the abutment surfaces are in contact with each other. And an engaged portion,
Each of the parent jigs has an intermediate jig locking portion for holding the engaged portions of the pair of intermediate jigs mounted on the shoulders and in which the contact surfaces are in contact with each other.
A jig unit for tensile test according to claim 1.   The shoulder portion has a circular planar shape centered on the central axis, and the intermediate jig locking portion has a circular planar shape centered on the central axis and larger in diameter than the shoulder portion. The shoulder hooking portion of each intermediate jig has a semicircular planar shape corresponding to a half of the shoulder portion, and the engaged portion of each intermediate jig is 3. The tension test jig unit according to claim 2, wherein the jig unit has a semicircular planar shape corresponding to a half portion of the parent jig. Attached to the other shoulder of the test piece through the outside in the direction intersecting the central axis of one of the parent jigs holding the pair of intermediate jigs attached to one of the shoulders of the test piece Is brought into contact with the contour portions of the other parent jig holding the pair of intermediate jigs, and the force in the opposite direction to the pulling direction applied from the front of the one parent jig is the one parent jig One of the load transmission jigs that transmits to each of the contour portions of the other parent jig over the other;
Through the outside in the direction intersecting with the central axis of the other parent jig, it abuts on each of the contour portions of the one parent jig, and the reverse direction to the pulling direction applied from the front of the other parent jig The other load transmission jig for transmitting the force of the second parent jig to the respective contour portions of the one parent jig through the other parent jig;
The jig unit for tensile tests according to claim 1, 2 or 3, further comprising A pair of intermediate jigs mounted respectively on a pair of shoulders to which a tensile force in a tensile direction in the test piece is applied;
A first parent jig holding one of the intermediate jigs and having a contour portion;
A second parent member having a contour portion and being disposed with a direction in a rotational direction around a central axis extending in the pulling direction shifted relative to the first parent jig and holding the other intermediate jig Tools,
And a load transmission jig for transmitting a force by contacting each of the contours of the first parent jig and the second parent jig,
The contour portions of the first parent jig and the second parent jig protrude from the other parent jig in a direction intersecting the central axis, and a plurality of contour portions exist at equal intervals in the rotation direction,
The load transfer jig transmits a force opposite to the tensile force of the test piece to the contour portions of the first parent jig and the second parent jig.
Jig unit for tensile test.   A jig is mounted on the shoulders respectively formed at both ends in the tensile direction of the fractured part to be fractured by application of tensile force in the tensile direction in the test piece, and the jig is used to connect the fractured part by the tensile tester. When carrying out a tensile test by applying a tensile force in the tensile direction, a jig unit for tensile test according to claim 1, 2, 3, 4 or 5 was used as the jig and mounted on the shoulder portion A tensile test method for applying a tensile force in the tensile direction to each contour portion of a parent jig of the jig unit for tensile test.

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